From a Home screen, navigate: Apps icon > Settings > Mobile Hotspot & Tethering.
Tap Mobile Hotspot.
If presented with Mobile Hotspot info screen, tap OK.
Tap the Password field then enter the preferred password.
If the field is greyed out, tap the switch to turn off Mobile Hotspot.
Password must be at least 8 characters.
The new password must be entered on the connecting device.